Final answer:
The phase that follows the telogen stage of hair growth is called the anagen phase, where new hair begins to grow. It can last several years with a growth rate of 0.3 mm per day, replacing an average of 50 hairs daily.
Step-by-step explanation:
The unofficial phase of hair growth that follows the telogen stage is referred to as the anagen phase. The telogen phase is a period of rest where the hair follicle is dormant. After this phase, the anagen phase begins, marking a cycle of new hair growth. The basal cells in the hair matrix divide to produce a new hair follicle, which pushes the old hair out as the growth cycle repeats itself. This anagen phase can last for several years during which the hair grows continuously.
Hair typically grows at the rate of 0.3 mm per day during the anagen phase. On average, each day, 50 hairs are lost and replaced. If hair loss exceeds the rate of replacement, it can lead to thinning or balding, which may be influenced by factors such as hormones or dietary changes.